Humans cannot see, smell, or taste individual micro-organisms such as bacteria, protozoa and certain fungi and algae. Such living organisms are microscopic and too small to be seen without magnification instruments (they were first observed by Anton van Leeuwenhoek in 1675).
Some micro-organisms reproduce, replicate and swarm to form clusters large enough to be seen, smelled and tasted by humans. For example, bunches of mold spores -members of the fungi kingdom- on a loaf of bread may be seen, smelled and tasted, while an individual mold spore is undetectable.
Another example is the bacteria that cause bad breath. While not visible to the naked eye, clusters of the bacteria do have a unique taste and smell.Learn More
A few of the microorganisms most harmful to humankind are Staphylococcus aureus, Escheria coli, Enterococcus faecium and Pseudomonas aeruginosa. Microorganisms that cause disease are referred to as pathogens.Full Answer >
Denitrifying bacteria are microorganisms that convert nitrates in soil into free atmospheric nitrogen, depleting the soil of fertility and reducing agricultural productivity, as described by Encyclopedia Britannica. Among the known or suspected denitrifying bacteria are Thiobacillus denitrificans, Micrococcus denitrificans and some species of Serratia, Pseudomonas and Achromobacter.Full Answer >
Probiotics are microorganisms, such as bacteria and yeast, found naturally in the intestines, according to WebMD. The human intestinal tract contains more than 500 types of bacteria that help digest food. The American Gastroenterological Association indicates the two most common types of commercially available probiotics include various strains of Lactobacillus and Bifidobacterium.Full Answer >
Humans are deuterostomes. Deuterostomes belong to the even larger bilateria group. The bilateria group of organisms is thus named because the organisms are bilaterally symmetrical with matching left and right sides to their bodies.Full Answer >